Ok, so this is solved. I updated the picture in
my posting above accordingly.
If I had a dead Pulsar for analysis I wouldn't ask so many dumb questions
About Rx and Ry probably being meant as inductors: If the intention had been to create as much inductance as possible on the given board area, they would have used a spiral-shaped trace. In fact, the meandering type is the way to get as little parasitic inductance as possible (less than a straight line of same length).
Edit: "just for fun" I tried to estimate the trace
length of Rx: counted 4432 pixels in my picture (I'd say +/- 5%), guess 31.2 pixels/mm from the pin spacing of the LED display (2.54mm) ->
135.4mm = 5.3". So specific resistance is 89kΩ/135.4mm = 657Ω/mm.
Did the same with Rb resistors (2.22kΩ) that appear to have identical trace width: 120 pixels = 3.85mm -> 2.22kΩ/3.85mm = 577Ω/mm - that's 12% less, but still a rather good match considering the quite inaccurate method of measurement.